Fig. 4: Planar GNRs on Au(111) after annealing at 300 °C. | Communications Chemistry

Fig. 4: Planar GNRs on Au(111) after annealing at 300 °C.

From: Preferential graphitic-nitrogen formation in pyridine-extended graphene nanoribbons

Fig. 4

a STM topography image acquired in the occupied density of states. Most of the edge extensions have an upward (left side) or downward (right side) bend, with the exception of the two highlighted by green arrows (scale bar: 1 nm, scanning parameters:-1.0 V, 100 pA). b STM topography image of the same segment acquired in the unoccupied density of states. The edge extensions are imaged as bright dots, with the exception of the two indicated by green arrows (scale bar: 1 nm, scanning parameters: 0.80 V, 100 pA). c Bond-resolved nc-AFM image of the same segment of Py-7-AGNRs, revealing specific bonds in the pyridine extensions that appear darker. (open feedback parameters: −5 mV, 200 pA, Δz: 220 pm from Au(111) surface; frequency: 27401 Hz) (d) Nc-AFM image of a short segment of another Py-7-AGNR. The blue dashed box highlights a unit with fully graphitic-N edges, while the green box indicates a unit with pyridinic-N. (open feedback parameters: −5 mV, 200 pA, Δz: 210 pm from Au(111) surface; frequency: 27401 Hz) (e) DFT-based nc-AFM simulations of pyridinic-N (green) and graphitic-N (blue) units (scale bar: 1 nm).

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